Description
Evaluating field performance history of existing concrete structures provides an opportunity for producers and specifiers to determine the potential for deleterious alkali-silica reactivity (ASR) of concrete and the aggregates it contains. However, field performance history is not typically used and the more traditional accelerated/aggressive laboratory tests such as ASTM C1260, C1567, and C1293 are chosen. This TechNote discusses the evaluation of field performance history and the benefits that it may provide.
Keywords:
alkali-silica reactivity (ASR); existing structures; field performance history.
Table of Contents
Introduction
Question
Response
Discussion
Establishing field history
Field observation of ASR
Establishing alkali loading: Alkali content, cement content of concrete, and SCM use
Sample selection
Petrographic analysis
A combined approach to ASR assessment
Reporting the results
Summary
References
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